Abstract
Posterior circulation aneurysms are rare in young patients but more common than in adults, tend to be larger and more complex, and often require endovascular treatment. However, in some cases, the aneurysm could occlude naturally, which was commonly defined as spontaneous thrombosis. We report the rapid spontaneous and complete thrombosis of an unruptured posterior cerebral artery aneurysm at the P1–P2 junction in a young patient who presented with blurred vision and consistent headaches. Complete spontaneous thrombosis cannot always be considered a permanent curative event. Its natural history may be associated with risks of recanalisation, rupture, and ischemic stroke. Conservative treatment of unruptured aneurysms with spontaneous thrombosis is a safe therapeutic option but requires periodic clinical and imaging follow-up.
